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This does two things.
1) Makes the file parameter optional, removing the requirement that
callers create an io.BytesIO object if all they want is the bytes. This
is done by renaming all of the rdata subclass to_wire() methods to
_to_wire(), and making dns.rdata.to_wire() create the io.BytesIO
internally if needed, and then delegate to the subclass.
2) Add canonicalize=False parameter, allowing code reuse for conversion
to wire format and conversion to hashable format. This also removes all
of the rdata subclass to_digestable routines that are no longer needed,
as dns.rdata.to_digestable will work for all rdata types.
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When calling from_text, the zone code needs to apply the current origin
(which may or may not be the zone origin, if sub-zone $ORIGIN statements
are present), and may also want to relativize the contents to the zone
origin.
Previously, this was done by explicitly reading records as absolute, and
then relativizing them laster. With this change, the work is moved to
the tokenizer.
This gets rid of the remaining internal uses of
dns.rdata.choose_relativity(), which prevents rdata from being
immutable.
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